Removed from:
- ParseBenchmark

Replaces `.*proto.*` with `.*/generated-test-sources/protobuf/.*` in such way will be excluded just the generated code and not the whole `proto` directory

Removes the `descriptor` variable because is unused.

Removes the `gson/src/test.*` path from the `-XepExcludedPaths` parameter of the ErrorProne plugin

This commit fix all `UnusedVariable` warns given by ErrorProne in the `gson/src/test.*` path.

Some field is annotated with `@Keep` that means is used by reflection.
In some other case the record is annotated with `@SuppressWarnings("unused")`

This commit fix all `JavaUtilDate` warns given by ErrorProne in the `gson/src/test.*` path.

Classes/Methods are annotated with `@SuppressWarnings("JavaUtilDate")` because it's not possible use differente Date API.

This commit fix all `EqualsGetClass` warns given by ErrorProne in the `gson/src/test.*` path.

I have rewrite the `equals()` methods to use `instanceof`

This commit fix all `JdkObsolete` warns given by ErrorProne in the `gson/src/test.*` path.

In some cases I have replaced the obsolete JDK classes with the newest alternatives.  In other cases, I have added the `@SuppressWarnings("JdkObsolete")`

This commit fix all `ClassCanBeStatic` warns given by ErrorProne in the `gson/src/test.*` path.

I have added the `static` keyword, or I have added `@SuppressWarnings("ClassCanBeStatic")`

This commit fix all `UndefinedEquals` warns given by ErrorProne in the `gson/src/test.*` path.

I have added `@SuppressWarnings("UndefinedEquals")` or fixed the asserts

Note: In this commit I have also renamed a test from `testRawCollectionDeserializationNotAlllowed` to `testRawCollectionDeserializationNotAllowed`

This commit fix all `GetClassOnEnum` warns given by ErrorProne in the `gson/src/test.*` path.

I have replaced the `.getClass()` with `.getDeclaringClass()`

This commit fix all `ImmutableEnumChecker` warns given by ErrorProne in the `gson/src/test.*` path.

I have added the `final` keyword, or I have added the `@SuppressWarnings("ImmutableEnumChecker")` annotation

This commit fix all `StaticAssignmentOfThrowable` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `AssertionFailureIgnored` warns given by ErrorProne in the `gson/src/test.*` path.

I have added the `@SuppressWarnings("AssertionFailureIgnored")` annotation

This commit fix all `ModifiedButNotUsed` warns given by ErrorProne in the `gson/src/test.*` path.

I have added the `@SuppressWarnings("ModifiedButNotUsed")` annotation

This commit fix all `MissingSummary` warns given by ErrorProne in the `gson/src/test.*` path.

I have remove the Javadoc `@author`

This commit fix all `FloatingPointLiteralPrecision` warns given by ErrorProne in the `gson/src/test.*` path.

I have added the `@SuppressWarnings("FloatingPointLiteralPrecision")` annotation

This commit fix all `StringSplitter` warns given by ErrorProne in the `gson/src/test.*` path.

I have replaced the `String.split(...)` with `Splitter`

This commit fix all `EmptyCatch` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `UnicodeEscape` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `EmptyBlockTag` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `LongFloatConversion` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `LongDoubleConversion` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `TruthAssertExpected` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `UnusedMethod` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `UnusedTypeParameter` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `CatchFail` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `MathAbsoluteNegative` warns given by ErrorProne in the `gson/src/test.*` path.

This commit fix all `LoopOverCharArray` warns given by ErrorProne in the `gson/src/test.*` path.

`toCharArray` allocates a new array, using `charAt` is more efficient

This commit fix all `HidingField` warns given by ErrorProne in the `gson/src/test.*` path.

This commit implements some other code review feedback

Thi commit removes the `.*extras/src/test.*` path from the `-XepExcludedPaths` parameter of ErrorProne.

This commit fix all `JavaUtilDate` warns given by ErrorProne in the `extras/src/test.*` path.

This reverts commit a7cca38.