Remove SkThread.h, include SkMutex.h or SkAtomics.h as appropriate.

Remove SkThread.h, include SkMutex.h or SkAtomics.h as appropriate.

SkThread.h doesn't do anything anymore execept include those two,
and thankfully, it doesn't seem to be mentioned outside Skia.

No public API changes.
TBR=reed@google.com

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/c50acf2321d7a934c80d754e9cbe936dfb8eb4cc

Committed: https://skia.googlesource.com/skia/+/1b24933e52f50773de29332387a12721811f3012

[mtklein_C, 2015-07-01 20:08:17]

The CQ bit was checked by mtklein@chromium.org

[commit-bot: I haz the power, 2015-07-01 20:08:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215393002/1

[commit-bot: I haz the power, 2015-07-01 20:12:36]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-01 20:12:37]

Exceeded global retry quota

[mtklein_C, 2015-07-01 20:22:21]

The CQ bit was checked by mtklein@chromium.org

[commit-bot: I haz the power, 2015-07-01 20:22:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215393002/20001

[commit-bot: I haz the power, 2015-07-01 20:24:16]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-01 20:24:17]

Try jobs failed on following builders:
  Build-Ubuntu-Clang-x86_64-Debug-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-Clang-x...)

[mtklein_C, 2015-07-01 20:25:42]

The CQ bit was checked by mtklein@chromium.org

[commit-bot: I haz the power, 2015-07-01 20:25:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215393002/40001

[commit-bot: I haz the power, 2015-07-01 20:30:53]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-01 20:30:55]

Try jobs failed on following builders:
  Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-Shared-Trybot on client.skia
(JOB_FAILED,
http://build.chromium.org/p/client.skia/builders/Test-Ubuntu-GCC-GCE-CPU-AVX2...)

[mtklein_C, 2015-07-01 20:48:55]

The CQ bit was checked by mtklein@chromium.org

[commit-bot: I haz the power, 2015-07-01 20:49:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215393002/60001

[commit-bot: I haz the power, 2015-07-01 21:01:02]

Committed patchset #4 (id:60001) as
https://skia.googlesource.com/skia/+/c50acf2321d7a934c80d754e9cbe936dfb8eb4cc

[jvanverth1, 2015-07-02 13:42:17]

A revert of this CL (patchset #4 id:60001) has been created in
https://codereview.chromium.org/1214603003/ by jvanverth@google.com.

The reason for reverting is: Breaking the roll.

E.g. on android_chromium_gn_compile_dbg:

FAILED: /b/build/goma/gomacc
../../third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++
-MMD -MF obj/skia/ext/libskia.SkMemory_new_handler.o.d -DV8_DEPRECATION_WARNINGS
-DCLD_VERSION=1 -DENABLE_NOTIFICATIONS -DENABLE_BROWSER_CDMS -DENABLE_PRINTING=1
-DENABLE_BASIC_PRINTING=1 -DDONT_EMBED_BUILD_METADATA -DUSE_OPENSSL=1
-DUSE_OPENSSL_CERTS=1 -DNO_TCMALLOC -DDISABLE_NACL -DENABLE_CONFIGURATION_POLICY
-DENABLE_SUPERVISED_USERS=1 -DENABLE_AUTOFILL_DIALOG=1 -DUSE_PROPRIETARY_CODECS
-DV8_USE_EXTERNAL_STARTUP_DATA -DVIDEO_HOLE=1 -DMOBILE_SAFE_BROWSING
-DSAFE_BROWSING_SERVICE -DCHROMIUM_BUILD -D_FILE_OFFSET_BITS=64 -DANDROID
-DHAVE_SYS_UIO_H -DCOMPONENT_BUILD -D__GNU_SOURCE=1 -D_DEBUG
-DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1
-DSKIA_IMPLEMENTATION=1 -DSK_ARM_HAS_OPTIONAL_NEON -DSK_GAMMA_APPLY_TO_A8
-DSK_GAMMA_EXPONENT=1.4 -DSK_GAMMA_CONTRAST=0.0
-DSK_DEFAULT_FONT_CACHE_LIMIT=1048576 -DSK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS
-DSKIA_DLL -DGR_GL_IGNORE_ES3_MSAA=0 -DSK_SUPPORT_GPU=1 -DSK_BUILD_FOR_ANDROID
-DUSE_CHROMIUM_SKIA -DXML_STATIC -I../.. -Igen
-I../../third_party/skia/include/private -I../../third_party/skia/src/core
-I../../third_party/skia/src/image -I../../third_party/skia/src/opts
-I../../third_party/skia/src/pdf -I../../third_party/skia/src/ports
-I../../third_party/skia/src/sfnt -I../../third_party/skia/src/utils
-I../../third_party/skia/src/lazy -I../../skia/config -I../../skia/ext
-I../../third_party/skia/include/c -I../../third_party/skia/include/config
-I../../third_party/skia/include/core -I../../third_party/skia/include/effects
-I../../third_party/skia/include/images -I../../third_party/skia/include/lazy
-I../../third_party/skia/include/pathops -I../../third_party/skia/include/pdf
-I../../third_party/skia/include/pipe -I../../third_party/skia/include/ports
-I../../third_party/skia/include/utils -I../../third_party/skia/include/gpu
-I../../third_party/skia/src/gpu -I../../third_party/zlib
-I../../third_party/expat/files/lib -I../../third_party/freetype-android/include
-I../../third_party/freetype-android/src/include
-I../../third_party/android_tools/ndk/sources/android/cpufeatures
-fno-strict-aliasing -march=armv7-a -mfloat-abi=softfp -mtune=generic-armv7-a
-mthumb -mthumb-interwork -fno-tree-sra -fno-caller-saves -funwind-tables -fPIC
-pipe -ffunction-sections -funwind-tables -fno-short-enums -finline-limit=64
-mfpu=vfpv3-d16
-isystem../../third_party/android_tools/ndk/sources/cxx-stl/llvm-libc++/libcxx/include
-isystem../../third_party/android_tools/ndk/sources/cxx-stl/llvm-libc++abi/libcxxabi/include
-isystem../../third_party/android_tools/ndk/sources/android/support/include
-fvisibility=hidden
--sysroot=/b/build/slave/android_chromium_gn/build/src/third_party/android_tools/ndk/platforms/android-16/arch-arm
-Os -fdata-sections -ffunction-sections -fomit-frame-pointer -g1 -Wno-format
-Wendif-labels -Werror -Wno-missing-field-initializers -Wno-unused-parameter
-Wno-psabi -Wno-extra -Wno-ignored-qualifiers -Wno-type-limits
-Wno-unused-local-typedefs -fno-threadsafe-statics -fvisibility-inlines-hidden
-std=gnu++11 -fno-rtti -fno-exceptions -Wno-deprecated -Wno-narrowing
-Wno-literal-suffix -Wno-error=c++0x-compat -Wno-non-virtual-dtor
-Wno-sign-promo -c ../../skia/ext/SkMemory_new_handler.cpp -o
obj/skia/ext/libskia.SkMemory_new_handler.o
../../skia/ext/SkMemory_new_handler.cpp:12:52: fatal error:
third_party/skia/include/core/SkThread.h: No such file or directory
 #include "third_party/skia/include/core/SkThread.h".

[mtklein, 2015-07-07 19:07:31]

The CQ bit was checked by mtklein@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-07-07 19:07:47]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215393002/60001

[commit-bot: I haz the power, 2015-07-07 19:15:23]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-07 19:15:24]

Dry run: This issue passed the CQ dry run.

[mtklein, 2015-07-07 19:19:58]

Hey sheriff, going to try landing this again.  It broke the roll last time, but
I think I've got it fixed.  So, just FYI.

[mtklein, 2015-07-07 19:20:14]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-07-07 19:20:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215393002/60001

[commit-bot: I haz the power, 2015-07-07 19:21:26]

Committed patchset #4 (id:60001) as
https://skia.googlesource.com/skia/+/1b24933e52f50773de29332387a12721811f3012